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将Fe-Cr-Ni-Co合金堆焊在304不锈钢表面,再对冷却后的堆焊层进行表面重熔,进行不同时间的空蚀实验。采用失重分析、扫描电镜(SEM)和X射线衍射仪分析空蚀后的合金层,与304不锈钢和堆焊层对比,研究了表面重熔对耐空蚀性能的影响。结果表明:堆焊层和重熔层的耐空蚀性能远高于304不锈钢,重熔后的合金层其耐蚀性优于堆焊层;在空蚀过程中发生了奥氏体向马氏体的转变,吸收了空蚀能量,延缓了空蚀的进行;堆焊合金的表面重熔使晶粒细化,细化的晶粒对裂纹发展的阻止作用提高了耐空蚀性能。
The Fe-Cr-Ni-Co alloy is deposited on the surface of 304 stainless steel, and then the surface layer of the surfacing layer after cooling is remelted. Cavitation erosion experiments are carried out at different time. The effects of surface remelting on cavitation erosion resistance were investigated by weight loss analysis, scanning electron microscopy (SEM) and X-ray diffraction (XRD) analysis of the cavitated alloy layer compared with 304 stainless steel and surfacing layer. The results show that the corrosion resistance of overlay and remelt layer is much higher than that of 304 stainless steel. The corrosion resistance of the remelted alloy layer is better than that of overlay layer. During the cavitation process, The absorption of cavitation energy delayed the cavitation erosion. The surface remelting of the surfacing alloy refined the grains and the finer grains prevented the crack growth and improved the cavitation erosion resistance.